Die grinder



E. R. JONES Feb. 27, 1934.

DIE GRINDER Filed Sept. 16, 1933 INVENTOR Ernest 75. Jones.

ATTORNEY Patented Feb. 27, 1934 UNITED STATES DIE GRINDER Ernest R. Jones, Detroit, Mich.

Application September 16, 1933 Serial N0. 689,746

4 Claims.

This invention relates to die grinders and the object of the invention is to provide a grinder for grinding the edges of dies at an angle to provide clearance for the die in cutting operations.

One of the particular objects of the invention is to provide a grinding wheel extending through an opening in a table and adjustable in position to grind at any angle to which it is set.

Another object of the invention is to provide an adjusting means for adjusting the angle of the axis of the grinding wheel and arranged so that the grinding wheel and driving means are swung from a pivot at one side of the axis of the grinding wheel.

Another object of the invention is to provide a die grinder in which the grinding wheel and driving means therefor may be independently adjusted longitudinally of the axis of the grinding wheel and driving means therefor.

These objects and the several novel features of the invention are hereinafter more fully described and claimed and the preferred form of construction by which these objects are attained is shown in the accompanying drawing in which- Fig. 1 is a front elevation of a die grinder embodying my invention.

Fig. 2 is a side elevation thereof.

Fig. 3 is a section taken on line 3-3 of Fig. 1.

Fig. 4 is a section taken on line 4--4 of Fig. 1.

As shown in Figs. 1 and 2 the device comprises a base member 1 having an opening 2 in the front side. A fixed bed or table top 3 is provided at the top of the base member having a central to opening 4 therein through which the grinding wheel 5 extends. A shaft 6 connects the side members '7 of the base and is secured in these side members. A frame 8 is provided as shown in Figs. 1 and 2 and is provided with an enlarged upper end through which the shaft 6 extends so that the member 8 is pivotally mounted on the said shaft. This member 8 is provided with ways 9 in which a motor carriage 10 is slidably mounted. This member 10 is provided with a thread- 46 ed boss 11 extending from the back side thereof as shown in Figs. 2 and 4. A screw shaft 12 is threaded through the boss 11 and is rotatably mounted in a boss 13 which is formed integrally with the frame member 8 as will be understood from Fig. 2. This screw shaft 12, as shown in Fig. 3, is provided with a bevel gear 14 on the upper end thereof meshing with a similar bevel gear 15 on the shaft 16. The shaft 16 is rotatably mounted in brackets 17 formed inte- J grally with the frame 8 and is provided with a hand wheel 18 on the outer end thereof which may be turned to raise or lower the carriage 10 in the ways 9. A compressed air motor 19 is mounted on the carriage 10 and is provided with a central shaft 20 to which the grinding wheel 60 5 is secured At the lower end the compressed air hose 21 for the compressed air motor 19 is carried out through the base and is connected into a compressed air line.

A stud shaft 22 is secured in a boss 23 in the frame member 8 and extends through an arcuate slot 24 in the wall of the base and an adjusting knob 25 is threaded onto the end of the stud shaft 22 and may be turned up tightly to bindingly secure the frame 8 at any adjustment on the pivot shaft 6.

The machine is particularly adapted for use in grinding the edges of dies to provide the proper clearance and to grind the edge of a die to a predetermined contour or to the form of a template. In use the die is placed on the table top 3 and the knob 25 is released to allow the frame 8 to be swung from the pivot 6 to the desired angle for which purpose the boss 26 about the slot 24 may be graduated to indicate degrees of angularity. When the device is set at the proper degree, the knob 25 is turned up to tightly secure the device in the adjusted position. At this time the hand wheel 18 may be turned to raise or lower the carriage 10 with the drive motor and grinding wheel, the object being to adjust the height of the grinding wheel 5 to proper position in relation to the work. After the adjustments have been completed, the air line may be opened to rotate the motor and drive the grinding wheel and while the grinding wheel is rotating, the edge of the die may be brought into contact therewith to grind the desired clearance or desired angle of face.

I have shown and described a compressed air motor for driving the grinding wheel but it will be readily understood that an electric motor may be as readily mounted on the member 10 and may be provided with a direct drive to the grinding wheel 5 or the shaft for the grinding wheel 5 may be mounted in individual bearings and driven by a flexible drive connection from the electric motor.

While I have described the device for use in grinding edges of dies, the grinding wheel 5 may be replaced with a sanding wheel or router for use in woodworking and in facing the edges of wood pieces.

From the foregoing description, it becomes evi dent that the device is very simple and efflclent in operation, will not easily get out of, order, provides a means for adjusting the height and angularity of the grinding wheel and provides a device which accomplishes the objects described.

Having thus fully described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is 1. Ina die grinder, a base having atop provided with a central opening, a frame pivotally mounted beneath the top and at one side of the said opening, a carriage slidably mounted in the frame, a motor mounted on the carriage and provided with a shaft extending through the opening in the top, an abrasive member of smaller diameter than the opening and secured to the shaft, means for adjusting the frame on its pivot to vary the angle of the abrasive member, a shaft.

rotatably mounted on the frame, a hand wheel for rotating the shaft and a threaded lug on the carriage through which the shaft is threaded, thearrangement being suchthat by turning the hand wheel the carriage is raised or lowered in the' frame.

2. In. a die grinder, a base having a top provided witha central opening, a frame pivotally mounted in the. base beneath the top and at one side of. the said opening, the frame being provided with ways, a carriage slidably mounted in the ways, a motor mounted on the carriage and #1 provided-wither, shaft extending through the opening in the top, an abrasive member of smaller diameter than the opening and secured to the extending end of the shaft, manually operable means for adjusting the frame on its pivot to vary the angle of the abrasive member and manually operable means for raising and lowering the carriage in the ways on the frame.

3. In a die grinder, a base having a top provided with a central opening, a frame pivotally mounted beneath the top and at one side of the said opening, a carriage slidably mounted in the frame, a motor mounted on the carriage and provided with a shaft extending through the opening: in the top, a grinding wheel secured to the shaft, means for adjusting the frame on its pivot to vary the angle of the grinding wheel and manually operable means for raising and lowering the carriage in the frame.

4. In a die grinder, a base having a top provided with a central opening, a frame pivotally mounted at one side of the base, a carriage slidably mountedin the frame, a motor supported on the carriage, means for raising and lowering the carriage, the motor being provided with a shaft extendingv through the opening of the table top, a grinding wheel of smaller diameter than the opening secured to. the shaft and means for turning the carriage on its pivot.

ERNEST R. JONES. 

